Improvement in leather-skiving machines



3 Sheets-Sheet 1. M. A. HOLTON. Leather-Skving Maohie.

No. 220,286. Patented oct. 7, |879.

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M. A. HoLToN. Leather-Skving Machine.

No. 220,286. Patented oct. 7, 1879.

CY.' f Y L my f/ymaz @/@WA @725% @2g /r//ffw d M UNITED STATES PATENTOEEIcE.

MERRITT A. HOLTON, OF FITOHBURG, MASSACHUSETTS.

IMPROVEMENT IN LEATHER-SKIVING MACHINES.

Specification forming part of Letters Patent No. 220.286, dated October7, 1879; application filed i August 8, 1879.

To all whom it may concern:

Be it knownthat I, MERRITT AUSTIN HOL- 'rON, of Fitchburg, in the countyof Worcester and Commonwealth of Massachusetts, have invented certainnew and useful Improvements in Leather-Skiving Machines; and I do herebydeclare the following to be a full, clear, and

Fig. 4 is a top or plan view of the impressionroll. Fig. 5-is a sideView. Fig. 6is abrokenaway sectional view, showing the transversespringstop and a cam ou feed-wheel D for operating said stop.

My invention relates to certain new and useful improvements in the classof machines especially adapted for skiving leather or other similararticles, having for its object skiving leather so as to leave anirregular surface 5 and the invention consists, essentially, of a pairof rolls for binding the material to be skived, so as to bring the partsto be skived or cut in aline with the edge of the knife.

lt also consists in novel means for feeding the material at the propertime to the rolls.

It further consists in novel means for holding material to be passedbetween the rolls against the irregular roll, and pressing the materialinto the impression on it.

It finally consists in the general construction and arrangement ofparts, as will be hereinafter fully described and claimed.

To enable others skilled in the art to make and use my invention, I willproceed to describe the exact mannerin which I have carried it out.

In the drawings, A representsthe base, and B a vertical forked standard,upon which the operating mechanism is mounted. C and D represent rolls,mounted on shafts c d, journaled in the boxes c1 dl, formed on theforward ends of the pivoted arins CD, secured to the standards by boltsc2 d, passing through boxes c3 d3, formed on the \rear.ends of saidarms,

the upper roll, O, having an impression, b,

on its surface corresponding to the impression l of the material to beskived, varying in depth according to the thickness of the material tobe skived.

The lower or feed roll, D, is provided with a corrugated or serratedsurface, a, and is provided with annular grooves a, in which tit theforward ends of a series of arms, E, journaled or pivoted on the bolt orrod e. The rear ends of said arms rest in the grooves f of the bar F,and the forward ends of said arms are held in contact with or againstthe surface of the leather as it passes beneath the roll by means of thebent or curved springs erpressing down upon their rear ends. The objectof the arms E is to press the material passing between the rolls intothe impression of the roll O. A spring, G, arranged under the box of thelower roll, D, regulated by a set-screw, g, is to allow for theunevenness of the material passing between the rolls.

The screws EI H are for adjusting the roll C, the arm C of which swingsupon the bolt c2, and thus determines the thickness of the piece skived.The screw I, passing through the arm D', and striking against theprojection I on the standard B, is to prevent the roll D, as it swingson the bolt d2, from coming into too close proximity with the knife Jand the roll O. The knife 'J rests on a table, K, secured to thestandard B in front of the rolls, said knife being provided withelongated slots j j, and is adjustably secured upon said table, so as tobe moved toward or from the roll by set-screws i t'.

K represents a horizontal table, secured to the standard B, in rear ofthe rolls, by screws k k, and upon this table the material to be skivedis placed and fed to the rolls, said table being provided with aguide-fork.

L represents a transverse spring-stop, arranged in front of the table K,and between the rolls O and D, against which the material to be skivedrests, said stop being actuated or moved transversely by means of a cam,l arranged on the inner periphery of the roll This cam is arranged onroll D so that it will engage with a shoulder or stud on said springstopL and move it transversely away from the rolls,

and permit the material to be carried between the rolls just as theimpression on the roll C comes around to said stop.

The shaft c is provided at one end with a hand-Wheel, M, for revolvingthe roll C, and a gear-wheel, m, mounted on said shaft c, and meshingwith a gear-wheel, m', mounted on the shaft d of the lower roll,communicates motion thereto. Tile rolls C D move at a uniform rate ofspeed, and revolve so that their points of near contact will be towardthe edge of the knife.

The operation of my improved machine is as follows: The leather or likesubstance is placed upon the table K so that the forward end thereofrests against the spring-stop L. The rolls are then revolved, and as theimpression in roll C comes around to said stop it is thrown away fromthe rolls, so that the material is carried forward between the rolls U D(and the portion to be skived forced into the impression of the roll Cby the springarms E) and against the knife, to be -skived or cut in amanner corresponding with the impression in the roll C.

I am aware that skiving-machines with a plain cylindrical feeding-rolland spring presser-feet carrying a plate have heretofore been used; butthese presser-feet, having no independent movement, would not operate asthe series of independent presser-feet operate in my machine. Theycannot follow the irregularities of the surface of roll, and so pressthe leather into these irregularities to make the cutting conformthereto, while each presserfoot in my machine forces the leather againstthat part of the roll opposite it, and makes it conform to theirregularities of the roll.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In a leather-skiving machine, the roller C, havingan irregular surface, in combination with a series of independenty-operating spring presser-arms to hold the leather against theirregularities of the roller, substantially as set forth.

2. The irregular-faced roller G, in combination with the slottedfeed-roll D, presser-arms E, springs e', and knife J, substantially asand for the purpose described.

3. The irregular-faced roller C, in combination with the feed-roller D,cam l, spring-stop L, and knife J, substantially as set forth.

4. The combination, with the arm D', carrying the roll D, of theadjusting-screw I and projection or stop I', substantially as and forthe purpose specified.

MERRITT AUSTIN BOLTON.

Attest:

H. M. FRANCIS, E. P. LoRING.

